I am generally a good tipper, but I definitely am not onboard with tip jars appearing everywhere and all sorts of people expecting to be tipped...movers, furniture delivery guys, maids at hotels, landscapers, the list goes on and on. There are occupations that expect tips now that most definitely did not 10-15 years ago.
I understand that some of these jobs are not the highest paid, but I do not think it is my responsibility to try to determine who is being paid "fairly" and give them some cash to make up for this perceived inequity. They are working for a wage they agreed to, if they are not happy they should try to find another job - just like I have done if I feel like I am not getting a fair deal.